diff --git a/litex/soc/software/include/base/spisdcard.h b/litex/soc/software/include/base/spisdcard.h
index 83689d5e8..851415787 100644
--- a/litex/soc/software/include/base/spisdcard.h
+++ b/litex/soc/software/include/base/spisdcard.h
@@ -3,4 +3,4 @@ int spi_sdcard_read_sector(uint32_t device, uint32_t lba,uint_least8_t *buf);
 
 uint8_t spi_sdcard_goidle(void);
 uint8_t spi_sdcard_readMBR(void);
-uint8_t spi_sdcard_readFile(char *, char *, uint32_t);
+uint8_t spi_sdcard_readFile(char *, char *, unsigned long);
diff --git a/litex/soc/software/libbase/spisdcard.c b/litex/soc/software/libbase/spisdcard.c
index 2027a0a2c..0befe993b 100644
--- a/litex/soc/software/libbase/spisdcard.c
+++ b/litex/soc/software/libbase/spisdcard.c
@@ -523,7 +523,7 @@ uint8_t spi_sdcard_readMBR(void)
 //      Return 0 success, 1 failure
 //
 // Details from https://codeandlife.com/2012/04/02/simple-fat-and-sd-tutorial-part-1/
-uint8_t spi_sdcard_readFile(char *filename, char *ext, uint32_t address)
+uint8_t spi_sdcard_readFile(char *filename, char *ext, unsigned long address)
 {
     int i, n, sector;
     uint16_t fileClusterStart;